Instead of using our overactive imaginations let us leave it to the manufacturer to do the answering:

Statement on “red dot” label on Mars chocolate products in Egypt:

Mars products always comply to the legal and cultural norms of all the markets it does business in. Mars products, including Snickers, Bounty and Mars bars do not contain pork nor pork derivatives. Mars products are exported to a number of markets, of which India is one; the red dot that may appear on some of our packaging is a legal requirement for the Indian Market. It indicates that the product may contain egg, which is not suitable for some vegetarians in India. Still, to further clarify the matter, we are currently completing the process of separating the packaging for the two markets which will minimize future misunderstanding.